Acoustic filter with two different channels with compensation for rejection
US6313717A · kind A · utility
5Cited by
11References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1999 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Aug 16, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/42
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A surface acoustic wave filter includes first and second channels, each channel including at least one input transducer and one input transducer. The transfer functions of the first channel and of the second channel are in phase in the passband of the filter and in antiphase in the rejection band of the filter. The filter enables the use of frequency responses for each channel, with wide bands enabling high reduction of the size of the filter while at the same time reducing the rejection band of the total filter. Such a filter may find particular application to mobile telephony.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.